Fabrication of Tehermochromic Thin Films by the Sol-Gel Method

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J. Korean Ceram. Soc. > Volume 35(1); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(1): 11.

Sol-Gel법에 의한 Thermochromic 박막 제조

장원식, 김석범, 강승구, 조동수¹

경기대학교 재료공학과
¹인하대학교 기기분석실

Fabrication of Tehermochromic Thin Films by the Sol-Gel Method

ABSTRACT

$VO_2$ thin films have been prepared on borosilicate glass substrate using alkoxide method to characterize the effects of fabricating factors on thermochromic performance. The gel films formed by spin coating were converted to $V_2O_5$ phase during oxidizing heat-tratment and the $VO_2$ phase were formed by reducing heat-treatement. The thermochromic switching properties of $VO_2$ thin films are strongly affected by the crystal phase and microstructure and those could be controlled by reducing heat-treatment conditions. The ther-mochromic switching characteristics of $VO_2$ thin films synthesized were measured at IR (2.5$mutextrm{m}$) as the transition temperature of $63^{circ}C$ the transition width of $3.6^{circ}C$and the maximum and minimum transmittance of 84% and 14% respectively.

Key words: Sol-Gel, $VO_2$, Thermochromic, Transmittance, Transitions, Switching, Thin film